Refrigerator with temperature control

ABSTRACT

An insulated icemaking compartment is provided in the fresh food compartment of a bottom mount refrigerator. The icemaking compartment may be integrally formed with the liner of the fresh food compartment, or alternatively, may be modular for installation anywhere in the fresh food compartment. A removable bin assembly with a front cover normally seals the icemaking compartment to maintain the temperature in the compartment. A cold air duct formed in the rear wall of the refrigerator supplies cold air from the freezer compartment to the icemaking compartment. A return air duct directs a portion of the air from the icemaking compartment back to the freezer compartment. An air vent in the icemaking compartment directs another portion of air into the fresh food compartment. A control system provides for controlling refrigerator functions in a manner that promotes energy efficiency.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.11/421,800, filed on Jun. 2, 2006, which is a continuation of U.S.patent application Ser. No. 11/139,237, now U.S. Pat. No. 7,337,620,filed on May 27, 2005, which is a continuation-in-part of U.S. patentapplication Ser. No. 11/131,701, now U.S. Pat. No. 7,284,390, filed onMay 18, 2005.

BACKGROUND OF THE INVENTION

Household refrigerators generally come in three structural styles: (1) aside-by-side model wherein the freezer and refrigerator compartments areside by side; (2) a top mount model wherein the freezer compartment islocated above the refrigerator compartment; and (3) a bottom mount modelwherein the freezer compartment is mounted below the refrigeratorcompartment. An icemaker is normally provided in the freezer compartmentof all three models. A door mounted ice dispenser is often provided in aside-by-side refrigerator and in a top mount refrigerator so that aperson can add ice to a glass without opening the freezer orrefrigerator door. However, a door mounted ice dispenser normally is notbeen provided in bottom mount refrigerators, since the freezer door istoo low, and there are difficulties in transporting ice from the freezercompartment to the refrigerator compartment which precludes a dispenserin the refrigerator compartment door. However, it is desirable to havean ice dispenser in the refrigerator compartment of a bottom mountrefrigerator.

Providing an icemaking compartment within the fresh food compartment ofa refrigerator presents numerous issues, both structural and functional.For example, the fresh food compartment is normally about 40° F., whilean ice compartment needs to be less than 32° F. in order to make iceeffectively and efficiently and is typically at, or about 0° F.Maintaining and controlling the temperature within the icemakingcompartment requires insulation, seals, appropriate airflow, and acontrol system. Placing the icemaking compartment within the fresh foodcompartment of the refrigerator also requires consideration ofelectrical connections of the icemaker and the supply of water to theicemaker. The method of manufacturing of such an icemaking compartmentwithin the fresh food compartment of a refrigerator also raises noveland unique considerations which are not factors for an icemakingcompartment mounted in a freezer.

U.S. Pat. No. 6,735,959 issued to Najewicz discloses a thermoelectricicemaker placed within the fresh food compartment of a bottom mountrefrigerator that may be dispensed through the fresh food door. Najewiczforms ice within the fresh food compartment using the thermoelectricicemaker even though the compartment is above a freezing temperature.Although Najewicz provides for a duct that runs from the freezercompartment to the thermoelectric icemaker, the cold air from the ductis used to remove heat from the thermoelectric icemaker. Najewicz hasmany problems that must be overcome in order to be practical includingthe removal of unfrozen water, rapid ice body formation, prolonged icestorage, etc. The present invention overcomes these problems.

BRIEF SUMMARY OF THE INVENTION

Therefore it is a primary object, feature, or advantage of the presentinvention to improve over the state of the art.

A further object, feature, or advantage of the present invention is theprovision of an improved refrigerator having an icemaking compartmentwithin the fresh food compartment.

Another object, feature, or advantage of the present invention is theprovision of a refrigerator having a separate icemaking compartmentmaintained at a temperature between 0° and 32° F.

A further object, feature, or advantage of the present invention is theprovision of a refrigerator having an insulated icemaking compartmentremote from the freezer compartment.

Still another object, feature, or advantage of the present invention isthe provision of a bottom mount refrigerator having an icemakingcompartment integrally formed in the liner of the fresh foodcompartment.

Yet another object, feature, or advantage of the present invention isthe provision of a bottom mount refrigerator having a modular icemakingcompartment mounted in the fresh food compartment.

A further object, feature, or advantage of the present invention is theprovision of a bottom mount refrigerator having an icemaking compartmentin the fresh food compartment, and having an insulated and sealed frontcover on the icemaking compartment which can be opened to provide accessinto the compartment.

Another object, feature, or advantage of the present invention is theprovision of an icemaking compartment in the fresh food compartment of abottom mount refrigerator with a single electrical connection within theicemaking compartment for the wire harness of the icemaker.

Another object, feature, or advantage of the present invention is theprovision of an icemaking compartment in the fresh food compartment of abottom mount refrigerator wherein the water fill tube for supplyingwater to the icemaker extends downwardly through a vertically disposedhole in the top wall of the refrigerator.

Still another object, feature, or advantage of the present invention isthe provision of an icemaking compartment within the fresh foodcompartment of a bottom mount refrigerator wherein the water fill tubefor the icemaker is exposed to ambient air to prevent freezing of waterwithin the fill tube.

Yet another object, feature, or advantage of the present invention isthe provision of a bottom mount refrigerator having a recessed cavity inthe fresh food compartment in which a water tank is mounted.

A further object, feature, or advantage of the present invention is theprovision of an icemaking compartment which is formed separately fromand mounted into a fresh food compartment of a bottom mountrefrigerator.

Another object, feature, or advantage of the present invention is theprovision of a method of making a bottom mount refrigerator having anintegral ice compartment formed in the liner of the fresh foodcompartment.

Still another object, feature, or advantage of the present invention isthe provision of a control system for an ice compartment within thefresh food compartment of a refrigerator for controlling icemaking anddispensing.

Still another object, feature, or advantage of the present invention isthe provision of a refrigerator having a fresh food compartment with anicemaking compartment therein, and an ice dispenser in the door of thefresh food compartment.

Another object, feature, or advantage of the present invention is theprovision of a bottom mount refrigerator having an ice dispenser in thedoor of the refrigerator, also known as the fresh food, compartment.

Another object, feature, or advantage of the present invention is theprovision of an icemaker in the refrigerator compartment of a bottommount refrigerator, with a cold air duct to provide air from the freezercompartment to the icemaker.

Still another object, feature, or advantage of the present invention isthe provision of an icemaker in the refrigerator compartment of a bottommount refrigerator having efficient and timely icemaking capacity.

It is a further object, feature, or advantage of the present inventionto provide a bottom mount refrigerator that dispenses ice and waterthrough the door.

It is a still further object, feature, or advantage of the presentinvention to provide a refrigerator that is energy efficient.

Another object, feature, or advantage of the present invention is toprovide a refrigerator that enhances safety.

Yet another object, feature, or advantage of the present invention is toprovide a refrigerator that provides convenience to users.

A further object, feature, or advantage of the present invention is toprovide a refrigerator that is aesthetically pleasing to users.

A still further object, feature, or advantage of the present inventionis to provide a refrigerator with a control system design that minimizesthe complexity and the number of components necessary.

Another object, feature, or advantage of the present invention is toprovide a refrigerator with a drive for the ice box/fresh foodcompartment damper which provides feedback.

Yet another object, feature, or advantage of the present invention is toprovide a refrigerator with compartment light cutout.

A further object, feature, or advantage of the present invention is toprovide a refrigerator which disables the icemaker and dispenser whenthe fresh food compartment door opens.

A still further object, feature, or advantage of the present inventionis to provide a refrigerator with a menu-driven interface.

Another object, feature, or advantage of the present invention is toprovide a refrigerator with a variable speed fan.

One or more of these and/or other objects, features, or advantages ofthe present invention will become from the specification and claims thatfollow.

The bottom mount refrigerator of the present invention has an icemakerwithin an insulated icemaking compartment in the fresh food orrefrigerator compartment. Cold air is supplied to the icemakingcompartment from the freezer compartment via a cold air duct. A returnair duct extends from the icemaking compartment to the freezercompartment. The icemaking compartment also includes a vent opening forventing air to the refrigerator compartment. A fan draws or forces airthrough the duct from the freezer compartment to the icemakingcompartment. The temperature in the ice making compartment is between 0°F. to 32° F., which is colder than the temperature of the refrigeratorcompartment, but not as cold as the freezer compartment. The icemakingcompartment is preferably located in an upper corner of the refrigeratorcompartment. The door of the refrigerator compartment includes an icedispenser to supply ice to a person without opening the refrigeratorcompartment door. The door may include an ice bin for storing ice fromthe icemaker.

In the improved refrigerator of the present invention, the icemakingcompartment is insulated. Preferably, the icemaking compartment isformed integrally with the liner of the fresh food compartment.Alternatively, the icemaking compartment is formed separately from andmounted in the fresh food compartment. The icemaking compartmentincludes inner and outer shells, with insulation therebetween, as wellas an insulated front cover which provides an air-tight seal with theicemaking compartment when closed, and which can be opened to provideaccess to the icemaker and ice bin within the icemaking compartment. Thewater fill tube for the icemaking compartment extends through avertically disposed hole in the top wall of the refrigerator, and isexposed to ambient air to prevent freezing of water within the tube. Therefrigerator includes a recessed cavity in the back wall in which awater tank is mounted.

In the method of manufacturing the icemaking compartment of the presentinvention, the ice compartment is preferably formed in the liner of thefresh food compartment during the molding processing using oppositelydisposed forces. A three-dimensional plug forms the icemakingcompartment from a rear side of the fresh food compartment liner. Afront wall of the icemaking compartment is then cutout, so that an icebox can be inserted through the cutout into the icemaking compartment.

A control system is provided for the refrigerator for controlling themaking and dispensing of ice in the icemaking compartment within thefresh food compartment of the bottom mount refrigerator.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a bottom mount refrigerator according tothe present invention.

FIG. 2 is a perspective view of the bottom mount refrigerator having thedoors removed.

FIG. 3 is a view similar to FIG. 2 showing the cold air duct and returnair duct for the icemaking compartment.

FIG. 4 is a front elevation view of the bottom mount refrigerator of thepresent invention with the doors open, and illustrating the cold air andreturn air ducts.

FIG. 5 is a sectional view taken along lines 5-5 of FIG. 4.

FIG. 6 is a sectional view taken along lines 6-6 of FIG. 4.

FIG. 7 is a perspective view of the icemaker positioned within theicemaking compartment.

FIG. 8 is a perspective view of the fresh food compartment liner withthe integrally formed icemaking compartment of the present invention.

FIG. 9 is a front elevation view of the liner shown in FIG. 8 withoutthe ice box attached.

FIG. 10 is a side elevation view of the liner shown in FIG. 8.

FIG. 11 is a perspective view of the ice box which mounts to the linerin accordance with one embodiment of the present invention.

FIG. 12 is a right side elevation view of the fresh food compartmentliner showing the water tank recess formed in the rear wall.

FIG. 13 is a partial front elevation view of the fresh food compartmentliner showing the water tank recess.

FIG. 14 is a rear perspective view of the fresh food compartment linerwith the ice box installed within the outer shell of the fresh foodcompartment.

FIG. 15 is a front perspective view of the fresh food compartment withthe ice maker and pan assembly removed for clarity.

FIG. 16 is a perspective view of the liner, box and air ducts providedfor the icemaking compartment.

FIG. 17 is a front elevation view of the ice compartment with the panassembly moved for clarity.

FIG. 18 is a view showing an internal portion of the icemakingcompartment with a wire harness cavity in an open position.

FIG. 19 is a view similar to FIG. 16 showing the wire harness cavitywith a cover installed.

FIG. 20 is a perspective view from the front of the icemaker showing thebin and front cover in a closed position.

FIG. 21 is a view similar to FIG. 14 showing the bin and front cover inan open position.

FIG. 22 is a perspective view of the ice pan, auger and motor assembly.

FIG. 23 is an exploded view of the ice pan, auger and motor assembly.

FIG. 24 is a rear elevation view of the bin assembly seal for theicemaking compartment.

FIG. 25 is a sectional view taken along lines 25-25 of FIG. 24.

FIG. 26 is a front view of the water cavity formed within the rear wallof the fresh food compartment, with the water tank assembly mountedtherein.

FIG. 27 is a front view of the fresh food compartment showing the coverinstalled over the water tank cavity.

FIG. 28 is a perspective view of the water tank assembly of the presentinvention.

FIG. 29 is an exploded view of the water tank assembly of the presentinvention.

FIG. 30 is a perspective view showing the top of the refrigerator withthe water fill tube cup mounted thereon.

FIG. 31 is an enlarged view of the water tub fill cup showing thevertical hole through which the water fill tube extends.

FIG. 32 is a sectional view taking along lines 32-32 of FIG. 31.

FIG. 33 is an exploded perspective view of the air impingement system ofthe present invention.

FIG. 34 is an assembled perspective view of the air impingement systemin the ice box.

FIG. 35 is an assembled perspective view of the ice maker in the icebox.

FIG. 36 is a view showing the male mold for forming the liner of thefresh food compartment according to the preferred embodiment of thepresent invention.

FIG. 37 is a view similar to 36 showing the plug inserted for formationof the icemaking compartment.

FIG. 38 is a view of an alternative embodiment of an icemakingcompartment formed separately from the fresh food compartment liner andmounted therein.

FIG. 39 is an exploded view of the separate ice compartment of thealternative embodiment.

FIG. 40 is a block diagram of one embodiment of a control systemaccording to the present invention.

FIG. 41 is a flow diagram of an executive loop according to oneembodiment of the present invention.

FIG. 42 is a flow diagram of a calculate temperatures subroutineaccording to one embodiment of the present invention.

FIG. 43 illustrates one embodiment of a flow diagram for the adjustsetpoints subroutine.

FIG. 44A illustrates one embodiment of a flow diagram for the updatefreezer subroutine.

FIG. 44B illustrates one embodiment of a flow diagram for the updatefreezer cuts subroutine.

FIG. 44C illustrates relationships between the cooling flag, control,temperature, setpoint, cut-ins, cut-outs, and cycle time for the updatefreezer cuts subroutine.

FIG. 45A illustrates one embodiment of a flow diagram for the update icebox subroutine.

FIG. 45B illustrates one embodiment of a flow diagram for the update icebox cuts subroutine.

FIG. 45C illustrates relationships between the cooling flag, control,temperature, setpoint, cut-ins, cut-outs, and cycle time for the updateice box cuts subroutine.

FIG. 46A illustrates one embodiment of a flow diagram for the updatefresh food subroutine.

FIG. 46B illustrates one embodiment of a flow diagram for the updatefresh food cuts subroutine.

FIG. 46C illustrates relationships between the cooling flag, control,temperature, setpoint, cut-ins, cut-outs, and cycle time for the updatefresh food cuts subroutine.

FIG. 47 illustrates one embodiment of a flow diagram for the updatedefrost subroutine.

FIG. 48 illustrates one embodiment of a flow diagram for the checkstable cycles subroutine.

FIG. 49 illustrates one embodiment of a flow diagram for the scan icemaker subroutine.

FIG. 50 illustrates one embodiment of a flow diagram for the controlcompressor subroutine.

FIG. 51 illustrates one embodiment of a flow diagram for the controldamper subroutine.

FIG. 52 illustrates one embodiment of a flow diagram for the controldefrost heater subroutine.

FIG. 53 illustrates one embodiment of a flow diagram for the controlevaporator fan subroutine.

FIG. 54 illustrates one embodiment of a flow diagram for the control icebox fan subroutine.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A bottom mount refrigerator is generally designated in the drawings bythe reference numeral 10. The refrigerator 10 includes a refrigerator orfresh food compartment 12 and a freezer compartment 14. Doors 16 areprovided for the refrigerator compartment or fresh food compartment 12and a door 18 is provided for the freezer compartment 14. One of thedoors 16 includes an ice dispenser 20, which may also include a waterdispenser.

Intermediate Temperature Icemaking Compartment

An icemaking compartment or intermediate compartment 22 is provided inthe refrigerator compartment 12. The icemaking compartment 22 is shownto be in one of the upper corners of the refrigerator, or fresh food,compartment 12, but other locations are also within the scope of thisinvention. The icemaking compartment 22 has a front cover 23 that isinsulated to prevent the cold air of the icemaking compartment 22 frompassing into the refrigerator compartment and opening 21 is providedthat mates with chute 19 of the ice dispenser 20. A seal may be providedbetween the opening 21 and chute 19 to prevent cold air from passingfrom the icemaking compartment to the refrigerator compartment 12. Chute19 may be adapted to engage opening 21 upon closing of door 16. Chute 19and opening 21 may be opposingly angled as to provide added sealing uponclosing of door 16. Additionally, an intermediate piece may be used toimprove the seal between chute 19 and opening 21. For example, aresilient seal may be used to assist in achieving this seal.Alternatively, a spring or other elastic material or apparatus may beutilized between or about the junction of chute 19 and opening 21. Otheralternatives for sealing between chute 19 and opening 21 should beevident to one skilled in the art.

Additionally, chute 19 should have a blocking mechanism located withinor about it to assist in preventing or decreasing the flow of air orheat transfer within chute 19. For example, a flipper door that operatesby a solenoid may be placed at the opening 21 to prevent cold air fromleaving the icemaking compartment 22 and entering into the refrigeratorcompartment.

Preferably, the icemaking compartment 22 includes an icemaker 50 (asdescribed below) that forms ice in an environment that is belowfreezing.

The icemaking compartment 22 may be integrally formed adjacent therefrigerator compartment 12 during the liner forming process andinsulation filling process. In such a process the intermediatecompartment may be separated on at least one side from the fresh foodcompartment by the refrigerator liner. Alternatively, the icemakingcompartment 22 may be made or assembled remotely from the fresh foodcompartment and installed in the fresh food compartment 12. For example,this compartment 22 may be slid into the refrigerator compartment 12 onoverhead rails (not shown) or other mounting. These methods arediscussed subsequently.

The refrigerator 10 includes an evaporator 24 which cools therefrigerator compartment 12 and the freezer compartment 14. Normally,the refrigerator compartment 12 will be maintained at about 40° F. andthe freezer compartment 14 will be maintained at approximately 0° F. Theicemaking compartment is maintained at a temperature below 32° F. orless in order to form ice, but is preferably not as cold as the freezercompartment 14. Preferably this temperature is in the range of 20° F.The walls of the icemaking compartment are insulated to facilitatetemperature control among other aspects. Grates or air vents 26 areprovided in the wall 28 between the refrigerator compartment 12 and thefreezer compartment 14 to allow air circulation between thecompartments.

Air Ducts

A cold air duct 30 extends between the freezer compartment 14 and theicemaking or specialty compartment 22. More particularly, the cold airduct 30 has a lower air inlet 32 within the freezer compartment 14 andan upper outlet end 34 connected to a fan 36 mounted on the back wall ofthe icemaker 22. The fan 36 draws cold air from the freezer compartmentand forces the cold air into the icemaker 22 so as to facilitateicemaking. It is understood that the fan 36 may be located at the inletend 32 of the cold air duct 30. The fan 36 controls the air flow fromthe freezer compartment 14 to the icemaking compartment 22 and may be avariable speed fan. The fan can be actuated by conventional means. Thecold air duct 30 preferably resides within the rear wall of therefrigerator 10, as seen in FIG. 5. The arrow 35 designates the air flowthrough the cold air duct 30.

The refrigerator 10 also includes a return air duct 38 having an upperend 40 connected to the icemaker 22, and a lower end 42 terminatingadjacent one of the air grates 26. Alternatively, the lower end 42 ofthe return air duct 38 may extend into the freezer compartment 14.Preferably, the return air duct 38 resides within the rear wall of therefrigerator 10, as seen in FIG. 6.

The icemaking compartment 22 also has an air vent for discharging airinto the refrigerator compartment 14. Thus, a portion of the air fromthe icemaking compartment 22 is directed through the return air duct 38to the freezer compartment 14, as indicated by arrow 43 in FIG. 3, andanother portion of the icemaking compartment air is vented through theopening 44 into the refrigerator compartment 12, as indicated by arrows45 in FIG. 3.

As seen in FIG. 4, the ice is discharged from the icemaker 22 in anyconventional manner. Similarly, the ice dispenser 20 functions in aconventional manner.

Icemaker

As seen in FIG. 7, an icemaker 50 is positioned within the icemakingcompartment 22 with the ice storage area 54 with auger (not shown)removed for clarity. The icemaker 50 is mounted to an impingement duct52. The impingement duct receives freezer air coming from the freezercompartment through the cold air duct 30 and the fan assembly 36. Theopening 44 vents air into the refrigerator compartment 12. The augerassembly (not shown) is provided beneath the icemaker 50 along with anice storage bin with an insulated cover 23. Impingement on the icemaker, as well as other aspects of ice making, is disclosed inApplicant's concurrently filed U.S. application Ser. No. 11/140,100entitled REFRIGERATOR WITH IMPROVED ICEMAKER, filed on May 27, 2005 andis hereby incorporated by reference.

Control System (Generally)

As described in more detail below, a control system is provided thatutilizes the icemaking compartment 22, the cold air supply duct 30, thereturn air duct 38, the variable speed icemaking fan 36, icemakingimpingement air duct 52, an icemaking compartment thermistor (notshown), an icemaking compartment electronic control damper, fresh foodair return ducts 26, and a fresh food compartment thermistor (notshown). The above components are controlled by an algorithm thatprioritizes the making of ice unless the fresh food temperature exceedsthe set point temperature. This prioritization is achieved as follows:

i. When ice is a priority, the fresh food damper is closed and the fanruns at optimum speed. In this way, supply air from the freezercompartment 14 is discharged through the impingement air duct 52,through the ice storage area 54, and through the icemaking compartmentreturn air duct 38. One of the results of this air flow, is that ice ismade at the highest rate.

ii. When the refrigerator compartment 12 is above set point, theelectronic control damper opens and the fan runs at optimum speed. Thesupply air to the icemaking compartment is routed almost entirely intothe fresh food compartment which forces the warmer air to return to theevaporator coil of the refrigerator. This achieves a rapid return to thefresh food set point after which the damper closes and the icemakingresumes.

iii. When the ice bin is full and the fresh food temperature issatisfied, the icemaking fan runs at minimum speed. Aspects of this willinclude: reduced energy consumption; reduced sound levels; and minimizedsublimation of ice.

The above control system permits precision control of both the icemakingcompartment 22 and the refrigeration compartment 12 separately, yetminimizes the complexity and the number of component parts necessary todo so.

Thermoelectric Alternative

A thermoelectric unit (not shown) may replace the impingement duct 52with some concessions. Preferably the thermoelectric unit would contourabout the icemaker as it effectively pulls heat out of the water.Alternatively, the thermoelectric unit could be the icemaker.Regardless, it should be understood that additionally, thethermoelectric unit would require a heat sink outside of the icemakingcompartment 22 to dissipate heat. A careful balance is required betweenthe voltage of the thermoelectric unit and the temperature of therefrigerator compartment 12 if the heat sink is in the refrigeratorcompartment 12. For example, the higher the voltage, the more heat willbe generated that will be required to be removed from the refrigeratorcompartment 12. A portion of the heat generated by the thermoelectricunit may be removed by venting freezer compartment air to thethermoelectric unit.

Integral Icemaking Compartment

FIGS. 8-25 and 33-35 show the preferred embodiment of the icemakingcompartment 22, wherein the compartment 22 is integrally formed with theliner 110 of the fresh food compartment 12. The integral formation ofthe ice compartment 22 takes place during the molding of the fresh foodcompartment liner 110. The liner 110 is formed in a conventional mannerfrom a flat sheet of material using male and female molds 112, 114, asseen in FIGS. 36 and 37. The sheet material is heated and then placedbetween the open molds 112, 114, which are then closed in a vacuum box.Simultaneously, a three-dimensional plug 116 is moved in a directionopposite the male mold 112 so as to deform the sheet material from therear side opposite the male mold 112. Alternatively, the plug 116 can bestationary and the liner 110 formed around the plug 116. The plug 116forms a notch 117 in an upper corner of the liner 110. The notch 117defines an outer shell 118 of the ice compartment 22. Thus, the outershell 118 is integrally formed with the liner 110 of the fresh foodcompartment 12. After the liner 110 and the outer shell 118 arecompletely formed, the plug 116 is withdrawn and the male mold 112 isseparated from the female mold 114. The liner 110 with the outer shell118 of the ice compartment 22 is then removed and cooled. The front wallof the outer shell 118 is punched or cut so as to form an opening 120. Asecond hole 121 is punched or cut in the shell 118 for the air vent 44.The liner 112 is then moved to a punch station to trim the edges of theliner 110.

The ice compartment 22 includes a box 122 which is inserted through thefront opening 120 into the outer shell 118 so as to define an innershell. The space between the outer shell 118 and the box or inner shell122 is filled with an insulating foam, such that the ice compartment 22is insulated. This insulation process may take place at the same timethat insulation is applied between the liner 110 and the outer cabinetof the refrigerator 10. The ice box 122 includes a rear hole 123 forconnection to the cold air duct 30, a second rear hole 125 forconnection to the return air duct 38, and a side hole 127 for the ventopening 44.

Modular Icemaking Compartment

As an alternative to an icemaking compartment formed integrally in theliner 110, the compartment 22 can be formed separately and then attachedto the liner. This modular compartment is shown in FIGS. 38 and 39, andincludes the liner 110A of the fresh food compartment, and the ice box122A, which preferably is insulated. All other features and componentsof the compartment 22 are the same, other than how it is made. Themodular unit can be mounted anywhere in the fresh food compartment 12.

Wire Harness

The ice compartment 22 is adapted to receive the icemaker 50, which ismounted therein using any convenient means. The ice box 122 includes arecess 124 adapted to receive the wire harness 126 for the icemaker 50.The wire harness 126 may be adapted to allow for connection to theicemaker 50 prior to complete insertion or mounting of the ice maker 50into the compartment 12. For example, the wire harness 126 may beadapted to be operatively connected to the refrigerator XX near thefront portion of ice box 122 to allow for sufficient travel of the icemaker upon insertion or mounting of the ice maker 50. As shown in FigureYY, wire harness 126 is operatively connected at the rearward portion ofice maker 50. In this case, an assembler may connect the wire harness126 to the ice maker 50 and/or the refrigerator XX prior to fullyinserting or mounting ice maker 50 into ice box 122.

A cover 128 may be provided for the wire harness recess 124 so as toenclose the wire harness 126 prior to connecting the harness 126 to theicemaker 50. The ice box 122 has a hole 129 in a side wall to mount theconnector or clip of the wire harness.

Ice Bin Assembly

The ice compartment 22 also includes an ice bin assembly 130. Theassembly 130 is removable for assembly, service, and user access to bulkice storage. The components of the bin assembly 130 are shown in FIGS.22 and 23. The bin assembly 130 includes a tray or bin 132 for receivingice from the icemaker 50. An auger 134 is mounted within the tray 132,with the first end 136 of the auger 134 being received in a motor 138which is mounted in the upstream end 140 of the tray 132. The second end142 of the auger 134 is mounted in a housing 144 on a front plate 146 ofthe bin assembly 130. A short piece of auger flighting 143 is providedon the second end 142 of the auger 134, within the housing 144. Thehousing 144 includes an outlet opening 148, with a flipper door 150 inthe housing 144 to control opening and closing of the outlet opening148. The flipper door 150 is mounted upon a shaft 152 extending throughthe tray 132. A spring 154 mounted on the shaft 152 engages the flipperdoor 150 to normally bias the door 150 to a closed position over theoutlet opening 148. The shaft 152 can be turned by a solenoid (notshown) so as to move the flipper door 150 to an open position relativeto the outlet opening 148, such that ice can be discharged from the tray132 to the dispenser 20.

Front Cover Seal

A two-piece front cover 162 is provided on the bin assembly 130. A frontcover 162 includes an inner panel 164 and an outer panel 166, as bestseen in FIG. 23. Insulation is provided between the inner and outerpanels 164, 166, such that the front cover 162 is insulated. The innerpanel 164 mounts onto the front plate 146 of the bin assembly 130. Aseal or compressible gasket 168 (FIG. 24) is provided around the outerperimeter front plate 146 so that when the bin assembly 130 is installedinto the ice box 122, an air-tight seal is provided between the binassembly 130 and the front opening 120 of the ice compartment 22. Theseal 168 helps maintain the lower temperature of the icemakingcompartment 22, as compared to the higher temperature of the fresh foodcompartment 12.

The front cover 162 includes a latch mechanism for releasably lockingthe cover 162 to the ice compartment 22. The latch mechanism includes alock bar 170 extending through a pair of collars 172 on the front plate146 of the bin assembly 130 for lateral sliding movement between alocked and unlocked position. The lock bar 170 is normally biased to thelocked position by a spring 174. A cam 176 is mounted on a peg 178 onthe front plate 146 of the bin assembly 130 and is adapted to engage aflange or finger 180 on the end of the lock bar 170. The cam 176overcomes the bias of the spring 74 when actuated by a finger button 182mounted on the outer panel 166, so as to release the front cover 162 forremoval of the bin assembly 130. Thus, the bin assembly 130 can be slidinto the ice box 122 and retained with an air-tight seal to maintain thetemperature of the ice compartment 22. A user can depress the button 182on the bin assembly 130 to release the lock bar 170 for removal of thebin assembly 130 from the ice box 122.

Air Impingement

Another component of the icemaker 50 is an air impingement assembly 190,as shown in FIGS. 33-35. The impingement assembly 190 includes amanifold 192 and a bottom plate 194 which define an air plenumtherebetween. The manifold 192 includes a plurality of holes or nozzles196. The manifold 192 is operatively connected to the cold air duct 30so the cold air from the freezer compartment 14 is directed into themanifold 192 by the fan 36, and through the impingement nozzles 196 ontothe bottom of the mold of the icemaker 50, as best seen in FIG. 34.

The nozzles 196 are shown to be round, but may also be slotted, or anyother shape. The nozzles 196 are preferably arranged in staggered rows.The diameter of the nozzles 196, the spacing between the nozzles 196,and the distance between the nozzles 196 and the ice mold are optimallydesigned to obtain the largest heat transfer coefficient for aprescribed air flow rate. For example, in a preferred embodiment, thenozzles 196 are round with a diameter of 0.2-0.25 inches, with a spacingof approximately 1.5 inches between adjacent nozzles, and a distance of0.5-1.0 inches from the surface of the icemaker 50. The alignment of thenozzles 196 with the ice mold preferably avoids direct air impingementon the first two ice cube slots near the icemaker thermostat so as toavoid hollow ice production.

The air impingement assembly 190 speeds ice production by 2-3 times soas to meet large requirements of ice. The impingement assembly 190 isalso compact so as to permit increased ice storage space in a largersized tray 132.

Bale Plate

The ice maker 50 includes a bale plate 198 which shuts off the ice maker50 when the level of ice cubes in the tray 132 reaches a pre-determinedlevel. The plate 198 is pivotally connected to the ice maker 50 by aconnector 200 at one end of the plate 198, as seen in FIG. 35. The plate198 pivots in a vertical plane. The plate 198 is stronger than aconventional wire bale arm. The vertical orientation of the plate 198prevents ice from hanging up on the plate, which happens with a wirebale arm. The plate includes a plurality of holes 202 to reduce weightand to improve air flow.

Water Valve and Tank Assembly

Prior art refrigerators with water and ice dispensers typically locatethe water system components, such as tanks, valves, filter and tubing,throughout the refrigerator cabinet and base pan areas. This arrangementis prone to service calls to repair leaks and water restrictions due tothe larger number of connections or fittings for the components. Themultiple connections and various tubing lengths also add tomanufacturing costs.

In the present invention, the water system is pre-assembled in a singlemodule that can be quickly and easily installed. The module has lesstubing runs and connections between components as compared to prior artwater systems.

The fresh food compartment 12 includes a recess or cavity 210 in therear wall adapted to receive a water valve and tank assembly 212. Thewater valve and tank assembly 212 is shown in FIGS. 28 and 29. Theassembly 212 includes a mounting bracket 214 which is secured in therecess 210 in the back wall of the fresh food compartment 12 in anyconvenient manner. A water tank 216 is mounted on the bracket 214 andincludes a water inlet line 218 and a water outlet line 220. A cover 222attaches to the rear wall of the fresh food compartment 12 so as to hidethe water tank 216 from view when the door 16 of the fresh foodcompartment 12 is opened.

The water inlet line 218 is connected to a conventional water supplyline. The water outlet line 220 is operatively connected to a filter224. Preferably, the filter 224 is pivotally mounted in the ceiling ofthe fresh food compartment 12, as disclosed in Applicant's co-pendingapplication Ser. No. 10/195,659, entitled HINGE DOWN REFRIGERATOR WATERFILTER, filed Jul. 15, 2002, which is incorporated herein by reference.

The water filter 224 has an outlet line 226 which is connected to awater solenoid valve 228 mounted on the bracket 214. The valve 228 has afirst outlet line 230 leading to the icemaker fill tube 232 and a secondoutlet line 234 leading to the water dispenser of the refrigerator 10.Line 234 has a fitting 236 which provides a quick connection with asimple ¼ turn, without threads to the water dispenser line in the door16.

In prior art refrigerators, the water tank is normally locateddownstream of the water valve and filter, so as to prevent subjectingthe water tank to inlet water supply pressures. In this invention, thetank 216 is designed to withstand inlet water supply pressures. Thelocation of the tank 216 in the recess 210 allows greater fresh foodstorage capacity. Also, the location of the tank 216 upstream from thefilter 224 and the valve 228 will reduce the service call rate. Thedownstream location of the filter 224 also removes plastic tastesassociated with the plastic tank 216, and allows chlorinated water to bestored in the tank 216, which prevents microbiological growth on theinterior of the water tank 216.

Water Fill Tube

Prior art icemaker fill tubes are normally installed in the back of afreezer and run down a sloping tube to the icemaker. As seen in FIGS.30-32, in the present invention the water fill tube 232 for the icemaker50 extends downwardly through a vertically disposed hole 236 in the topwall 238 of the refrigerator 10. The fill tube 232 is installed from thetop of the refrigerator 10 into a plastic cup 244 positioned within arecess 246 in the top wall 238. The fill tube 232 extends through theinsulation in the top wall 238 and into the icemaker 50 in the icemakingcompartment 22. The water conduit 230 extends through the foaminsulation in the top wall 238 and through an opening 248 in the cup 244for connection to a nipple 250 on the fill tube 232. The nipple 250 isangled slightly upwardly to prevent dripping. The cup 238 is open at thetop so as to expose the fill tube 232 to the ambient air, and therebyprevent freeze-up of the fill tube 232. This vertical orientation allowsthe fill tube 232 to be positioned closer to the end of the icemaker 50.

Control System Details

FIG. 40 illustrates one embodiment of a control system of the presentinvention suitable for use in a refrigerator having three refrigeratedcompartments, namely the freezer compartment, the fresh foodcompartment, and the ice making compartment. The three compartments arepreferably able to be set by the user to prescribed set temperatures.

In FIG. 40, a control system 510 includes an intelligent control 512which functions as a main controller. The present invention contemplatesthat the control system 510 can include a plurality of networked orotherwise connected microcontrollers. The intelligent control 512 can bea microcontroller, microprocessor, or other type of intelligent control.

Inputs into the intelligent control 512 are generally shown on the leftside and outputs from the intelligent control 512 are generally shown onthe right side. Circuitry such as relays, transistor switches, and otherinterface circuitry is not shown, but would be apparent to one skilledin the art based on the requirements of the particular intelligentcontrol used and the particular devices being interfaced with theintelligent control. The intelligent control 512 is electricallyconnected to a defrost heater 514 and provides for turning the defrostheater on or off. The intelligent control 512 is also electricallyconnected to a compressor 516 and provides for turning the compressor516 on or off. The intelligent control 512 is also electricallyconnected to a damper 518 and provides for opening or closing the damper518. The intelligent control 512 is also electrically connected to anevaporator fan 520 associated with the freezer compartment and providesfor controlling the speed of the evaporator fan 520. Of course, thisincludes setting the evaporation fan 520 to a speed of zero which is thesame as turning the evaporator fan 520 off. The use of a variable speedfan control is advantageous as in the preferred embodiment, the fan isserving an increased number of compartments with more states (freezer,fresh food, ice maker) and the ice compartment is remote from thefreezer compartment.

The intelligent control 512 is electrically connected to an ice box fan522 and provides for controlling the speed of the ice box fan 522. Ofcourse, this includes setting the ice box fan 522 to a speed of zerowhich is the same as turning the ice box fan 522 off. The intelligentcontrol 512 also receives state information regarding a plurality ofinputs. For example, the intelligent control 512 has a damper stateinput 530 for monitoring the state of the damper. The intelligentcontrol 512 also has a defrost state input 532 for monitoring the stateof the defrost. The intelligent control 512 also has a freezer doorinput 534 for monitoring whether the freezer door is open or closed. Theintelligent control 512 also has a fresh food compartment door input 536for monitoring whether the fresh food compartment door is open orclosed. The intelligent control 512 also has an ice maker state input538 for monitoring the state of the ice maker. The intelligent control512 has a freezer set point input 540 for determining the temperature atwhich the freezer is set by a user. The intelligent control 512 also hasa fresh food compartment set point input 542 for determining thetemperature at which the fresh food compartment is set by a user. Theintelligent control 512 is also electrically connected to fourtemperature sensors. Thus, the intelligent control 512 has an ice makertemperature input 544, a freezer compartment temperature input 546, afresh food compartment input 548, and an ambient temperature input 550.The use of four separate temperature inputs is used to assist inproviding improved control over refrigerator functions and increasedenergy efficiency. It is observed that the use of four temperaturesensors allows the ice maker temperature, freezer compartmenttemperature, fresh food compartment temperature, and ambient temperatureto all be independently monitored. Thus, for example, temperature of theice box which is located remotely from the freezer can be independentlymonitored.

The intelligent control 510 is also electrically connected to a displaycontrol 528, such as through a network interface. The display control528 is also electrically connected to a mullion heater 524 to turn themullion heater 524 on and off. Usually a refrigerator has a low wattageheater to supply heat to where freezing temperatures are not desired.Typically these heaters are 120 volt AC resistive wires. Due to the factthat these heaters are merely low wattage heaters, conventionally suchheaters remain always on. The present invention uses a DC mullion heaterand is adapted to control the DC mullion heater to improve overallenergy efficiency of the refrigerator and increase safety.

The display control 528 is also electrically connected to a cavityheater 526 for turning the cavity heater 526 on and off. The displaycontrol 528 is preferably located within the door and is also associatedwith water and ice dispensement. Usually a refrigerator with a dispenserwith a display on the door will also have an associated heater on thedoor in order to keep moisture away from the electronics of thedispenser. Conventionally, this heater is continuously on.

It is to be observed that the control system 510 has a number of inputsand outputs that are not of conventional design that are used in thecontrol of the refrigerator. In addition, the control system 510includes algorithms for monitoring and control of various algorithms.The algorithms used, preferably provide for increased efficiency whilestill maintaining appropriate temperatures in the ice maker, fresh foodcompartment, and freezer.

FIGS. 41-54 provide an exemplary embodiment of the present inventionshowing how the control system sets the states and controls refrigeratorfunctions based on those states, including states associated with thefresh food compartment, freezer compartment, and ice maker compartment.FIG. 41 is a flow diagram providing an overview of one embodiment of thepresent invention. In FIG. 41, an executive loop 560 is shown. In step562 a determination is made as to whether a set time period (such as 30seconds) has elapsed. If so, then a set of steps 564 are performed toupdate state variables. These state variables are updated through acalculate temperatures subroutine 566, an adjust setpoints subroutine568, an update freezer subroutine 570, an update ice box subroutine 572,an update fresh food compartment subroutine 574, an update defrostsubroutine 576, a check stable cycles routine 580, and a scan ice makersubroutine 582. Once the state variables are updated, then there are aset of control subroutines 566 which act on the state variables.

These control routines include a control compressor subroutine 584, acontrol damper subroutine 586, a control evaporator fan subroutine 588,a control ice box fan subroutine 590, and a control defrost heatersubroutine 592.

As shown in FIG. 41 the status of the state variables are regularlyupdated in the set of steps 564. After the state variables are updated,appropriate actions are performed to control refrigerator functions.

The calculate temperatures subroutine 566 is shown in greater detail inFIG. 42. In one embodiment, each compartment's temperature and theambient temperature are measured with thermistors to provide raw data.Regressed temperatures are calculated based in part on the rawtemperatures.

FIG. 43 illustrates a flow diagram for the adjust setpoints subroutine568. The user selects set points for the fresh food compartment(FFSetpoint) and the freezer compartment (FZSetpoint). Based on the usersettings, or other settings if a food saver feature is active(ff_saver_setpoint, fz_saver_setpoint), an ice maker set point(ICSetpoint) is set. Under default conditions (DEFAULT) the ice makerset point (ICSetpoint) is the same as the freezer set point(FZSetpoint). If the ice maker's bin is full (BIN_FULL), then the icemaker's set point (ICSetpoint) is set at a lower temperature to maintainthe ice and prevent melting. If the ice maker is turned off, then theice maker's set point is set at a higher temperature (ICE_EFF) therebyproviding an efficiency mode to thereby conserve energy. For example, itis generally expected that the ice maker's set point for storage(ICE_STORE) is less than the ice maker's temperature when the power isoff such as in an energy efficient mode of operation (ICE_EFF), which isless than the temperature required to melt ice. For example, the icestorage temperature (ICE_STORE) may be around 15 degrees Fahrenheitwhile the ice maker's efficiency temperature (ICE_EFF) is 25 degrees.Ice might begin to melt at a temperature of 28 degrees Fahrenheit.

Thus, in step 602 a determination is made as to whether the food saverfunction is active. If it is, then in step 604, the set point for thefresh food compartment (FFSetpoint) is set accordingly toff_saver_setpoint. Also, the set point for the freezer compartment(FZSetpoint) is set accordingly to fz_saver_setpoint and then thesubroutine proceeds to select the ice maker state in step 608. Returningto step 602, if the food saver function is not active, then in step 606,the fresh food set point (FFSetpoint) is set to a user selectedtemperature setting and the freezer set point (FZSetpoint) is set to auser selected temperature setting.

In step 608, the ice maker state is selected. If the ice maker state isturned off (PWR_OFF) to conserve energy, then the ice maker's set point(ICSetpoint) is set to an energy efficient temperature less than themelting point (ICE_EFF) in step 610. If the ice maker state indicatesthat the ice bin is full (BIN_FULL) then the ice maker's set point(ICSetpoint) is set to an ice storage temperature (ICE_STORE) in step612. If the ice maker state is the default state (DEFAULT) then the icemaker's set point (ICSetpoint) is set to the freezer set point(FZSetpoint).

FIG. 44A is a flow diagram illustrating one embodiment of the updatefreezer subroutine 570. The update freezer subroutine assists inincreasing the energy efficiency of the appliance because instead ofmerely turning on the freezer when temperature reaches a particularsetpoint, the update freezer subroutine also considers the states of thefresh food compartment and ice maker and how ultimately temperature willbe affected over time. The update freezer routing is used to set statesassociated with the freezer, fresh food compartment and ice maker. Instep 622 the fz_adj_cuts state is determined. If true then in step 630,the threshold is set to the freezer set point (FZSetpoint). If in step622, the fz_adj_cuts state is not true, then in step 628, the freezercut-in temperature (FZCutIn) is set to fz_cutin and the freezer cut-outtemperature is set to fz_cutout. Then in step 630, the threshold is setto the freezer set point (FZSetpoint).

In step 632 a determination is made as to whether the refrigerator state(FridgeState) is set to a sub-cool state (SUBCOOL). If it is, then instep 638, the Threshold is set to the difference of the Threshold andthe subcool_depression. Then in step 640, a determination is made as towhether the freezer is in the freezer cooling (FZCooling state). If itis, then in step 642, the Threshold is set to be the difference betweenthe Threshold and the freezer cut-out temperature (FZCutOut). Then instep 652, a determination is made whether the freezer controltemperature (FZControl) is less than or equal to the thresholdtemperature (Threshold). If it is, then in step 654, the freezer coolingcondition (FZCooling) is set to be FALSE and the first cut-outtemperature, CO(1), is set to the difference of the freezer setpoint(FZSetpoint) and the freezer control temperature (FZControl). Next instep 662, a determination is made as to whether the synchronize freshfood compartment with freezer (sync_ff_with_fz) or fresh food adjustcuts (ff_adj_cuts_states are TRUE. If one of these states are true, thenin step 660, the fresh food cooling state (FFCooling) is set to beFALSE. If, however, neither of these states are true, in step 670, adetermination is made as to whether the synchronize ice maker withfreezer (sync_ic_with_fz) or ice maker adjust cuts (ic_adj_cuts) statesare true. If one of these states is true, then in step 668, the icemaker cooling state (ICCooling) is set to FALSE.

Returning to step 650, if the freezer cooling state (FZCooling) is notset, then in step 646, the threshold (Threshold) is set to be the sum ofthe threshold (Threshold) and the freezer cut-in temperature (FZCutin).Then in step 648, a determination is made as to whether the threshold(Threshold) is greater than the sum of freezer's maximum set point(fz_max_setpoint) and the maximum freezer change (MAX_FZ_DELTA) dividedby two. If it is, then in step 650, the threshold (Threshold) is set tobe the sum of the freezer's maximum set point (fz_max_setpoint) and themaximum freezer change (MAX_FZ_DELTA) divided by two. Then in step 654 adetermination is made as to whether the freezer control temperature(FZControl) is greater than or equal to the threshold (Threshold). If itis, then in step 656 the freezer cooling state (FZCooling) is set to beTRUE. Then in step 658, the Update Freezer Cuts subroutine is executed.Next in step 664, a determination is made as to whether the synchronizefresh food compartment with the freezer compartment state(sync_ff_with_fz) or the fresh food adjust cuts state (ff_adj_cuts)state is true. If it is, then in step 666 the fresh food cooling state(FFCooling) is set to be true. Then in step 672, a determination is madeas to whether the synchronize ice maker with freezer state(sync_ic_with_fz) or the ice maker adjust cuts (ic_adj_cuts) states aretrue. If they are, then in step 674, the ice maker cooling state(ICCooling) is set to be true.

FIG. 44B is a flow diagram illustrating one embodiment of the updatefreezer cuts subroutine 658. In step 680, the cut-in temperatures areupdated by setting the second cut-in temperature, CI(2), to be equal tothe first cut-in temperature, CI(1). The first cut-in temperature,CI(1), is then set to be equal to the difference of the freezer controltemperature (FZControl) and the freezer setpoint (FZSetpoint). Also thestable cycles variable (StableCylces) is incremented. Next in step 682,the cycle times are updated by setting the second cycle time, CT(2), tobe equal to the first cycle time, CT(1). The first cycle time, CT(1), isthen set to the current cycle time. The average cycle time (CTavg) isthen computed as the average of the first cycle time, CT(1), and thesecond cycle time, CT(2). The CT0 is set to be target_cycle_minutes(target_cycle_minutes).

Next in step 686, a determination is made as to whether the freezeradjust cuts state (fz_adj_cuts) is true. If it is, then in step 688, adetermination is made as to whether there are more than three stablecycles (StableCycles). If there are, then in step 690, the desired deltais calculated from the deltas and the cut-out temperatures as shown. Thebounds of the calculated desired delta are then checked in steps692-698. In step 692, a determination is made as to whether 4(0) is lessthan the minimum freezer delta (MIN_FZ_DELTA). If it is, then in step694, 4(0) is set to be the minimum freezer delta (MIN_FZ_DELTA). If itis not, then in step 696, a determination is made as to whether 4(0) isgreater than the maximum freezer delta (MAX_FZ_DELTA). If it is, then instep 698, 4(0) is set to be the maximum freezer delta (MAX_FZ_DELTA). Instep 704, the desired freezer cut-out temperature (FZCutOut) and thedesired freezer cut-in temperature (FZCutIn) are set.

Then in step 684, the deltas are updated accordingly. In particular,Δ(2) is set to Δ(1). Also, Δ(1) is set to be the sum of the average ofCI(1) and CI(2) and CO(1). Also, Δavg is set to be the average of Δ(1)and Δ(2).

FIG. 44C shows the relationship between the cooling state or flag 712,and the control temperature 708 over time. Note that at point 716,CI(1), the cooling state of flag 712 cuts in, at point 714, CI(2), thecooling state or flag also cuts in, at point 718, CO(1), the coolingstate or flag cuts out. For cycle CT(1) 722 there is an associatedaverage control temperature (Tavg) and for cycle CT(2) 720 there is anassociated average control temperature (Tavg).

FIG. 45A illustrate one embodiment of the update ice box subroutine 572.In FIG. 45A, a determination is made in step 730 as to whether theicemaker adjust cuts state (ic_adj_cuts) is true. If not, then in step734, the ice maker cut in time (ICCutIn) and the ice maker cut out(ICCutOut) times are set. Then in step 738, the threshold (Threshold) isset to the ice maker set point (ICSetpoint). Next, in step 740, adetermination is made as to whether the ice maker cooling state(ICCooling) is set. If not, then in step 746, a determination is made asto whether the freezer cooling state (FZCooling) is set. If not, then instep 743, a determination is made as to whether the synchronize icemaker with freezer state (sync_ic_with_fz) is set. If it is, then instep 744, the threshold (Threshold) is set to the sum of the Thresholdand the ice maker cut-in adjustment value (IC_CI_ADJ). In step 748, thethreshold (Threshold) is set to be the sum of the threshold (Threshold)and the ice maker cut in (ICCutIn). Next in step 752, the upper boundfor the threshold is tested and if the bound is exceeded, in step 756,the threshold is set to be the upper bound. Next in step 754, adetermination is made as to whether the ice maker control (ICControl) isgreater or equal to the threshold. If it is, then in step 762, the icemaker cooling state is set to true.

Returning to step 740, if the ice maker cooling state is true, then instep 750, the threshold is set to the difference of the threshold andthe ice maker cutout. Then in step 758, the ice maker cooling state isset to be false.

In step 764 a determination is made as to whether the ice maker waspreviously in a cooling state. If not, then in step 766 a determinationis made as to whether the ice maker cooling state is true. If not, thenthe first cut-out time, CO(1) is set to be the difference between theice maker setpoint (ICSetpoint) and the ice maker control (ICControl).If it is, then in step 772, an update ice box cuts subroutine isexecuted. In step 770, the previous ice maker cooling stat (ICCoolPrev)is set to cooling (ICCooling).

FIG. 45B illustrates the ice box cuts subroutine 772. In step 780, thecut-ins are updated. In step 782 the deltas are updated. In step 784, adetermination is made as to whether the ice_adj_cuts state is true. Ifit is, then in step 786 a determination is made as to whether there havebeen at least three stable cycles. If so, in steps 788, 790, 792, and794, the boundaries of Δ0 are tested. In step 796 the desired cuts arecalculated.

FIG. 45C shows the relationship between the cooling state or flag 800,and the control temperature 814 over time. Note that at point 812,CI(1), the cooling state of flag 800 cuts in, at point 816, CI(2), thecooling state or flag also cuts in, at point 822, CO(1), the coolingstate or flag cuts out. For cycle CT(1) 818 there is an associatedaverage control temperature (Tavg) and for cycle CT(2) 820 there is anassociated average control temperature (Tavg).

FIG. 46A illustrates one embodiment of a flow diagram for the updatefresh food subroutine 574. In FIG. 46A, a determination is made as towhether the ice maker state (IMState) is melting. If it is, then in step858, the fresh food compartment cooling state is set to false. If it isnot, then in step 856 a determination is made as to whether the freezercooling state (FZCooling) is true. If it is not then in step 858 thefresh food compartment cooling (FFCooling) state is set to false. If thefreezer cooling (FZCooling) state is true, then in step 860, adetermination is made as to whether the ff_adj_cuts_state is true. If itis not, then in step 866 values for the fresh food cut-in and cut-outvalues are set accordingly. In step 868, the threshold (Threshold) isset to the fresh food compartment setpoint. In step 870, a determinationis made as to whether the fresh food cooling (FFCooling) state is true.If not in the fresh food cooling (FFCooling) state, then in step 872, adetermination is made as to whether the freezer cooling state is true.If it is then, the threshold is set in step 878. If it is not, then instep 874 a decision is made as to whether the threshold needs to beadjusted to compensate for the synchronization state. If it does notthen, in steps 876 and 878 the threshold is adjusted accordingly. Thenin step 880 a determination is made as to whether the fresh foodcompartment temperature is greater than or equal to the threshold. If itis, then in step 882, the fresh food cooling state (FFCooling) is set tobe true.

Returning to step 870, if the fresh food compartment cooling (FFCooling)state is true, then the threshold is modified in step 884. In step 886 adetermination is made as to whether the threshold is less than thedifference of the fresh food compartment's minimum setpoint and half ofthe maximum fresh food compartment change. If it is, then in step 890,the threshold is set to the difference of the fresh food compartment'sminimum setpoint and half of the maximum fresh food compartment change.Then in step 888 a determination is made as to whether the fresh foodcompartment control temperature is less than or equal to a threshold. Ifit is then the fresh food cooling state (FFCooling) is set to be false.In step 894, the fresh food cooling's previous state (FFCoolPrev) iscompared to the present fresh good cooling (FFCooling). If they are notequal, then in step 896, a determination is made as to whether the freshfood cooling (FFCooling) state is true. If it is then, an Update FreshFood Cuts subroutine 898 is run to update cut-in and cut-outtemperatures. If it is not then the cutout temperature, CO(1), is set tobe the difference between the fresh food setpoint (FFSetpoint) and thefresh food control setting (FFControl). Then in step 900 the previousfresh food cooling state (FFCoolPrev) is updated to the current freshfood cooling state.

FIG. 46B illustrates one embodiment of a flow diagram for the updatefresh food cuts subroutine 898. In step 910 the cut-in temperatures areupdated. In step 912, the deltas are updated. In step 914, adetermination is made as to whether the fresh food compartment cut-inand cut-out temperatures need adjustment. If they do, in step 916 adetermination is made as to whether there has been more than threeconsecutive stable cycles. If there has, then in steps 918, 920, 922,and 924, the delta is recalculated. In step 930 the cut-in and cut-outtemperatures for the fresh food compartment are adjusted accordingly.

FIG. 46C illustrates relationships between the cooling flag, control,temperature, setpoint, cut-ins, cut-outs, and cycle time for the updatefresh food cuts subroutine. FIG. 46C shows the relationship between thecooling state or flag 932, and the control temperature 934 over time.Note that at point 936, CI(1), the cooling state of flag 932 cuts in, atpoint 940, CI(2), the cooling state or flag also cuts in, at point 938,CO(1), the cooling state or flag cuts out. For cycle CT(1) 942 there isan associated average control temperature (Tavg) and for cycle CT(2) 944there is an associated average control temperature (Tavg).

FIG. 47 illustrates one embodiment of a flow diagram for the updatedefrost subroutine 576. In step 950 a determination is made as towhether to force a defrost. If a defrost is not forced, then in step 952the refrigerator state is selected. If a defrost is forced, then in step984 the defrost hold period is set, the refrigerator state is set todefrost and a flag for forcing a defrost is cleared.

Returning to step 952, the refrigerator state can be COOL, SUBCOOL,WAIT, DEFROST, DRIP, or PULLDOWN. If the refrigerator state is cool,then in step 956 a determination is made as to whether defrost is due.If it is, then in step 960 the defrost timer is set and in step 965, thefreezer cooling (FZCooling) state is set to true and the refrigeratorstate is set to SUBCOOL.

Returning to step 952, if the refrigerator is in the subcool state, thenin step 966 a determination is made as to whether the defrost timer hasexpired. If it has, then in step 970, the defrost timer is set and instep 976 the refrigerator state (FridgeState) is set to WAIT. If in step966 the defrost timer has not expired, then in step 972 a determinationis made as to whether the freezer is in the cooling state. If it is not,then in step 970 the defrost timer is set and in step 976 therefrigerator state (FridgeState) is set to WAIT.

Returning to step 952, if the refrigerator state (FridgeState) is WAIT,then in step 978 a determination is made as to whether the defrost timerhas expired. If it has, then in step 980 the defrost hold period is setand the refrigerator state is set to DEFROST.

Returning to step 952, if the refrigerator state (FridgeState) isDEFROST, then in step 982, a determination is made as to whether thedefrost is complete. If it is then in step 984, the defrost timer is setfor time associated with dripping (drip_time), the refrigerator state(FridgeState) is set to DRIP and the flag associated with forcingdefrost is cleared.

Returning to step 952, if the refrigerator state (FridgeState) is DRIP,then in step 986, a determination is made as to whether the defrosttimer has expired. If it has, then in step 988, the defrost timer is setand the refrigerator state is set to PULLDOWN.

Returning to step 980, if the state is PULLDOWN, a determination is madeas to whether or not the defrost timer has expired. If it has then instep 992, the freezer cooling state (FZCooling) is set to true and therefrigerator state (FridgeState) is set to COOL.

In step 996, a determination is made as to whether the refrigerator isin a DEFROST or COOL state. If it is, then the subroutine ends. If it isnot, then in step 994 a determination is made as to whether the defrosttimer has expired. If it has then the process returns to step 952. Ifthe defrost timer has not expired then the subroutine ends.

FIG. 48 illustrates one embodiment of a flow diagram for the checkstable cycles subroutine 580. The number of stable cycles is reset instep 1088 if in step 1080 the refrigerator is in the defrost state, instep 1082 the fresh food or freezer doors are open, in step 1084 thefresh food setpoint has changed, or in step 1086 the freezer setpointhas changed.

FIG. 49 illustrates one embodiment of a flow diagram for the scan icemaker subroutine 582. This subroutine scans the ice maker to check forvarious conditions that may affect control functions and sets statesassociated with the ice maker appropriately. In step 1100 adetermination is made as to whether the ice maker is in initialpulldown. If it is not, then in step 1102 a determination is made as towhether the ice maker control is above the melting temperature of ice.If it is then in state 1104, the ice maker state is set to MELTING. Ifnot, then in step 1106 a determination is made as to whether the freshfood compartment door is open. If it is, then in step 1108 the ice makerstate is selected. If the ice maker state is MELTING, then in step 1110the ice maker state is set to the previous ice maker state. If the icemaker state is set to HTR_ON then in step 1112 a determination is madeas to whether the fresh food compartment door has been open for longerthan a set dwell time. If it has, then in step 1110 the ice maker stateis set to the previous ice maker state. If has not then in step 1114 theice maker state remains unchanged. Similarly if the ice maker state isDEFAULT in step 1108 then the ice maker state remains unchanged in step1114.

In step 1116 a determination is made as to whether the ice maker poweris on. If not, then in step 1118 the ice maker state and the ice maker'sprevious state are set accordingly to indicate that the power is off. Instep 1120 a determination is made as to whether the ice maker's heateris on. If it is no then in step 1124 the ice maker's state is set toindicate that the heater is on. In step 1122 a determination is made asto whether the icemaker has been on less than a set dwell time. If ithas, then in step 1124 the ice maker's state is set to indicate that theheater is on.

In step 1126 a determination is made has to whether the ice maker'sheater has been on less than the amount of time associated with a fullbin (such as 120 minutes). If it has then in step 1128 the ice maker'scurrent state and previous state are set to indicate that the heater isoff. If not, then in step 1130 the ice maker's current state andprevious state are set to indicate that the bin is full.

FIG. 50 illustrates one embodiment of a flow diagram for the controlcompressor subroutine 584. In step 1150 the refrigerator's state(FridgeState) is examined. If the refrigerator is in the COOL state,then in step 1152 a determination is made as to whether the freezercooling state is true. If it is not, then in step 1154 a request is madeto turn the compressor off. If it is, then a request is made in step1156 to request that the compressor be on. If the state is SUBCOOL orPULLDOWN, then in step 1158 a request is made to turn the compressor on.If the state is DEFAULT, then in step 1160 a request is made to turn thecompressor off.

FIG. 51 illustrates one embodiment of a flow diagram for the controldamper subroutine 586. In step 1170 the refrigerator state is selected.If the refrigerator state is COOL or SUBCOOL then in step 1172 the icemaker state is selected. IF the ice maker state is HTR_ON then in step1174 a determination is made as to whether the evaporator fan is on. Ifit is then in step 1174 a request is made for the damper to be open. Ifnot, then in step 1178 a request is made for the damper to be closed. Ifin step 1172 the icemaker state is MELTING< then in step 1178 a requestis made for the damper to be closed. If the ice maker is in a differentstate (DEFAULT) then in step 1180 a determination is made as to whetherthe fresh food compartment is cooling. If it is not, then in step 1178 arequest is made for the damper to be closed. If it is, then in step 1182a request is made for the damper to be open. Returning to step 1170, ifthe refrigerator is in a DEFAULT state, then in step 1184 a request ismade to close the damper.

FIG. 52 illustrates one embodiment of a flow diagram for the controldefrost heater subroutine 592. In step 1200 the refrigerator state isselected. If the refrigerator state is DEFROST or DRIP, then in step1202 the defrost heater is turned on. If the refrigerator state is adifferent or DEFAULT state then in step 1204 the defrost heater isturned off.

FIG. 53 illustrates one embodiment of a flow diagram for the controlevaporator fan subroutine 588. In step 1210, the refrigerator state(FridgeState) is selected. If the state is COOL or SUBCOOL then in step1212 a determination is made as to whether the ice maker is in themelting state (MELTING). If it is, then in step 1214, the evaporator fanis turned full-on at the rail voltage. If not, then in step 1216, adetermination is made as to whether the freezer is in a cooling(FZCooling) state. If it is, then in step 1218, the evaporator fan isturned on at less than the rail voltage. If not, then in step 1220, adetermination is made as to whether the ice compartment is cooling(ICCooling).

FIG. 54 illustrates one embodiment of a flow diagram for the control icebox fan subroutine 590. In step 1230, a refrigerator state (FridgeState)is determined. If the refrigerator state is COOL or SUBCOOL, then instep 1232, the ice maker state is selected. If the ice maker state isMELTING, then the ice box fan is turned full-on in step 1240 such as byapplying the rail voltages to the ice box fan. If the ice maker stateindicates that the heater is on (HTR_ON), then the ice box fan is turnedof in step 1242. If the ice maker state is in a different or DEFAULTstate, then in step 1234 a determination is made as to whether the freshfood compartment is in a cooling (FFCooling) state. If it is, then instep 1244 the ice box fan is turned at less than full voltage toconserve energy. If not, then in step 1236 a determination is made as towhether the ice compartment is in a cooling (IceCooling) state. If it isin then in step 1246, the icebox fan Is turned on at a higher voltagethan in step 1244. In step 1238, if neither the fresh good compartmentis cooling or the ice maker compartment is cooling, the ice box fan isturned off. Thus the ice box fan is controlled in an energy efficientmanner.

Miscellaneous

Applicant's co-pending provisional application Ser. No. 60/613,241 filedSep. 27, 2004, entitled APPARATUS AND METHOD FOR DISPENSING ICE FROM ABOTTOM MOUNT REFRIGERATOR, is hereby incorporated by reference in itsentirety. This application and the provisional application both relateto a refrigerator with a bottom mount freezer and an icemakingcompartment for making ice at a location remote from the freezer.

The invention has been shown and described above with the preferredembodiments, and it is understood that many modifications,substitutions, and additions may be made which are within the intendedspirit and scope of the invention. From the foregoing, it can be seenthat the present invention accomplishes at least all of its statedobjectives.

What is claimed is:
 1. A method of controlling operation of arefrigerator comprising: a. obtaining temperature readings from each ofa fresh food compartment, a freezer compartment and an ice compartmentin an upper corner of the fresh food compartment in a interior space ofthe refrigerator; b. monitoring ambient temperature external of thespace; c. communicating the readings in electrical temperature signalsto an intelligent control; d. calculating with the intelligent control atemperature value for each of the fresh food compartment, the freezercompartment, and the ice compartment based on at least two of the icecompartment, fresh food compartment, freezer compartment, and ambienttemperature readings.
 2. The method of claim 1 wherein the interiorspace is enclosed by a cabinet which comprises a top, bottom, left side,right side, and back wall, and the ice compartment is disposed at ornear the top, left, and back walls.
 3. The method of claim 1 wherein thefresh food compartment is in an upper portion of the cabinet.
 4. Themethod of claim 3 wherein the freezer compartment is below the freshfood compartment.
 5. The method of claim 1 further comprising enteringof a user-selected temperature set point for one or more of the ice,fresh food, and freezer compartments.
 6. The method of claim 5 whereinthe calculated temperature value is dependent on the user-selectedtemperature set point for a given ice, fresh food, or freezercompartment.
 7. The method of claim 6 further comprising a coolingsystem operatively connected to and providing cooling to any of thefresh food, freezer, and ice compartments in response to electricalinstructions from the intelligent control.
 8. The method of claim 6wherein the cooling system responds to the one or more calculatedtemperature values.
 9. The method of claim 8 wherein a calculatingtemperature value is dependent on at least two temperature readings oftwo compartments.
 10. The method of claim 8 wherein the cooling systemresponse is dependent on at least one temperature reading and at leastone user-selected temperature set point.
 11. The method of claim 8wherein at least one temperature reading and at least one user-selectedtemperature set point are used to control cooling in the refrigerator.12. The method of claim 1 wherein cooling to a compartment is dependenton a temperature reading of one or more of the ice, fresh food, andfreezer compartments and ambient temperature.
 13. A method of operatinga refrigerator comprising: a. providing a refrigerator cabinet with afresh food compartment disposed within the cabinet, a freezercompartment disposed within the cabinet, an ice compartment disposedwithin the cabinet, an electronic control system associated with therefrigerator and adapted to monitor and control temperature in the freshfood compartment, the freezer compartment and the ice compartment, anice compartment temperature sensor associated with the ice compartmentand electrically connected to the electronic control system, a freshfood compartment temperature sensor associated with the fresh foodcompartment and electrically connected to the electronic control system,a freezer compartment temperature sensor associated with the freezercompartment and electrically connected to the electronic control system,and an ambient temperature sensor electrically connected to theelectronic control system; b. calculating with the electronic controlsystem a temperature value for each of the fresh food compartment, thefreezer compartment, and the ice compartment based on the readings of atleast two of the ice compartment, fresh food compartment, freezercompartment, and ambient temperature sensors.
 14. The method of claim 13wherein the ice compartment is in the fresh food compartment.
 15. Themethod of claim 13 wherein the freezer compartment is below the freshfood compartment.
 16. The method of claim 13 further providing a userinterface operatively connected to the electronic control systemallowing manual entering of a user-selected temperature value for one ormore of the ice, fresh food, and freezer compartments.
 17. The method ofclaim 13 wherein the electronic control system calculated temperaturevalue is compared to the user-selected temperature value for a givenice, fresh food, or freezer compartment.
 18. A method of controllingoperation of a refrigerator comprising: a. obtaining temperaturereadings from each of a fresh food compartment, a freezer compartmentand an ice compartment in an upper corner of the fresh food compartmentof the refrigerator, wherein the fresh food compartment is above thefreezer compartment; b. monitoring ambient temperature external of thespace; c. communicating the readings in electrical temperature signalsto an intelligent control; d. calculating with the intelligent control atemperature value for each of the fresh food compartment, the freezercompartment, and the ice compartment based on at least two of the icecompartment, fresh food compartment, freezer compartment, and ambienttemperature readings.
 19. The method of claim 18 further comprisingallowing a temperature set point to be selected from a user interface.20. The method of claim 19 wherein the user interface comprises adisplay control.